1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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7 | // * conditions of the Geant4 Software License, included in the file * |
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8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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9 | // * include a list of copyright holders. * |
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10 | // * * |
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11 | // * Neither the authors of this software system, nor their employing * |
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12 | // * institutes,nor the agencies providing financial support for this * |
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13 | // * work make any representation or warranty, express or implied, * |
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14 | // * regarding this software system or assume any liability for its * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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16 | // * for the full disclaimer and the limitation of liability. * |
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17 | // * * |
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18 | // * This code implementation is the result of the scientific and * |
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19 | // * technical work of the GEANT4 collaboration. * |
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20 | // * By using, copying, modifying or distributing the software (or * |
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21 | // * any work based on the software) you agree to acknowledge its * |
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22 | // * use in resulting scientific publications, and indicate your * |
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23 | // * acceptance of all terms of the Geant4 Software license. * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // |
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27 | // ------------------------------------------------------------------- |
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28 | // GEANT4 Class file |
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29 | // |
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30 | // For information related to this code contact: |
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31 | // |
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32 | // File name: G4CrossSectionPatch |
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33 | // |
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34 | // Author: |
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35 | // |
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36 | // Creation date: 15 April 1999 |
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37 | // |
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38 | // Modifications: |
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39 | // |
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40 | // ------------------------------------------------------------------- |
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41 | |
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42 | #include "globals.hh" |
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43 | #include "G4CrossSectionPatch.hh" |
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44 | #include "G4VCrossSectionSource.hh" |
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45 | #include "G4KineticTrack.hh" |
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46 | #include "G4CrossSectionVector.hh" |
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47 | |
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48 | G4CrossSectionPatch::G4CrossSectionPatch() |
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49 | { } |
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50 | |
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51 | |
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52 | G4CrossSectionPatch::~G4CrossSectionPatch() |
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53 | { } |
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54 | |
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55 | |
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56 | G4bool G4CrossSectionPatch::operator==(const G4CrossSectionPatch &right) const |
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57 | { |
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58 | return (this == (G4CrossSectionPatch*) &right); |
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59 | } |
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60 | |
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61 | |
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62 | G4bool G4CrossSectionPatch::operator!=(const G4CrossSectionPatch &right) const |
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63 | { |
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64 | return (this != (G4CrossSectionPatch*) &right); |
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65 | } |
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66 | |
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67 | |
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68 | G4double G4CrossSectionPatch::CrossSection(const G4KineticTrack& trk1, |
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69 | const G4KineticTrack& trk2) const |
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70 | { |
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71 | // The cross section is provided by one of the components, according to their energy |
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72 | // validity range |
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73 | |
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74 | G4double crossSection = 0.; |
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75 | G4double ecm = (trk1.Get4Momentum() + trk2.Get4Momentum()).mag(); |
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76 | |
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77 | const G4CrossSectionVector* components = GetComponents(); |
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78 | if (components != 0) |
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79 | { |
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80 | G4int nComponents = this->GetComponents()->size(); |
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81 | // G4int nValid = 0; |
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82 | |
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83 | G4int i; |
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84 | for (i=0; i<nComponents; i++) |
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85 | { |
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86 | G4CrossSectionSourcePtr componentPtr = (*components)[i]; |
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87 | G4VCrossSectionSource* component = componentPtr(); |
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88 | if (component->IsValid(ecm)) |
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89 | { |
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90 | crossSection = component->CrossSection(trk1,trk2); |
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91 | } |
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92 | else if (i < (nComponents - 1) ) |
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93 | { |
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94 | G4CrossSectionSourcePtr nextPtr = (*components)[i+1]; |
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95 | G4VCrossSectionSource* next = nextPtr(); |
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96 | if (ecm > component->HighLimit() && ecm < next->LowLimit()) |
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97 | { |
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98 | // Merge cross-sections in transition region between two validity ranges |
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99 | crossSection = Transition(trk1,trk2,component,next); |
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100 | } |
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101 | } |
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102 | } |
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103 | } |
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104 | |
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105 | return crossSection; |
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106 | } |
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107 | |
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108 | |
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109 | G4bool G4CrossSectionPatch::IsValid(G4double e) const |
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110 | { |
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111 | // The Patch is valid if any of its components are valid |
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112 | G4bool answer = false; |
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113 | const G4CrossSectionVector* components = GetComponents(); |
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114 | if (components != 0) |
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115 | { |
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116 | G4int n = components->size(); |
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117 | G4int i; |
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118 | for (i=0; i<n; i++) |
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119 | { |
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120 | G4CrossSectionSourcePtr componentPtr = (*components)[i]; |
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121 | G4VCrossSectionSource* component = componentPtr(); |
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122 | if (component->IsValid(e)) |
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123 | { |
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124 | answer = true; |
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125 | break; |
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126 | } |
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127 | } |
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128 | } |
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129 | return answer; |
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130 | } |
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131 | |
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132 | |
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133 | G4double G4CrossSectionPatch::Transition(const G4KineticTrack& trk1, const G4KineticTrack& trk2, |
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134 | const G4VCrossSectionSource* comp1, |
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135 | const G4VCrossSectionSource* comp2) const |
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136 | { |
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137 | //Merge two cross sections in the transition region between their validity ranges |
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138 | |
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139 | G4double crossSection = 0.; |
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140 | |
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141 | G4double ecm = (trk1.Get4Momentum() + trk2.Get4Momentum()).mag(); |
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142 | G4double sigma1 = comp1->CrossSection(trk1,trk2); |
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143 | G4double sigma2 = comp2->CrossSection(trk1,trk2); |
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144 | G4double denom = comp2->LowLimit() - comp1->HighLimit(); |
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145 | G4double diff = ecm - comp1->HighLimit(); |
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146 | if (denom > 0. && diff > 0.) |
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147 | { |
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148 | G4double ratio = diff / denom; |
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149 | crossSection = (1.- ratio) * sigma1 + ratio * sigma2; |
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150 | } |
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151 | |
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152 | return crossSection; |
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153 | } |
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154 | |
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155 | |
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156 | G4double G4CrossSectionPatch::Transition(G4double ecm, |
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157 | G4double sigma1, G4double sigma2, |
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158 | G4double e1, G4double e2) const |
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159 | { |
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160 | //Merge two cross sections in the transition region between their validity ranges |
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161 | |
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162 | G4double crossSection = 0.; |
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163 | |
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164 | G4double denom = e2 - e1; |
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165 | G4double diff = ecm - e1; |
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166 | if (denom > 0. && diff > 0.) |
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167 | { |
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168 | G4double ratio = diff / denom; |
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169 | crossSection = (1.- ratio) * sigma1 + ratio * sigma2; |
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170 | } |
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171 | |
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172 | return crossSection; |
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173 | } |
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174 | |
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